namespace Components {
  export namespace SubComponents {
    export class Test {}
  }
  export class Header {
    constructor() {
      const elem = document.createElement("div");
      elem.innerText = "This is Header";
      document.body.appendChild(elem);
    }
  }
  export class Body {
    constructor() {
      const elem = document.createElement("div");
      elem.innerText = "This is Body";
      document.body.appendChild(elem);
    }
  }
  export class Footer {
    constructor() {
      const elem = document.createElement("div");
      elem.innerText = "This is Footer";
      document.body.appendChild(elem);
    }
  }
}
